کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
3046590 1185046 2008 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A failure to stop and attention fluctuations: An evoked oscillations study of the stop-signal paradigm
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی عصب شناسی
پیش نمایش صفحه اول مقاله
A failure to stop and attention fluctuations: An evoked oscillations study of the stop-signal paradigm
چکیده انگلیسی

ObjectiveIt is not always clear whether inhibition or attention deficit underlies a failure to stop a prepared motor response. One possible way to approach this question is to resort to measures of evoked oscillations since functional correlates of different frequency oscillations are relatively well understood.MethodsThe present study examined event-related oscillations during a stop-signal task in non-clinical adults. In 25% of trials of an auditory discrimination tasks subjects had to refrain from a prepared motor response.ResultsIn successful stop trials, the Go N2 peaked later and the Stop N2 peaked earlier than in failed stop trials. Relative to successful, failed stop trials were associated with a larger N1–N2 and Go P3, and a smaller Stop P3 in the central and posterior cortical regions. The latter effect was exclusively determined by evoked delta oscillations, whereas all other frequency bands contributed to enhanced responses in failed comparative to successful stop trials.ConclusionsThe sum of presented evidence seems to show that success or failure to stop mostly depends on how the subject prepares for the Go and Stop stimuli in advance. If attention is more directed towards the Stop signal, the stopping succeeds, otherwise it fails.SignificanceThese data may contribute to understanding the cognitive basis of successful and unsuccessful stopping performance.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Clinical Neurophysiology - Volume 119, Issue 3, March 2008, Pages 556–567
نویسندگان
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